A hiker who was bitten by a rattlesnake on Saturday in a Colorado park died hours later.

Daniel Hohs, 31, was rushed to hospital in Lakewood after first responders received a call at about 12.40pm, according to KDVR-TV.

Hohs was reportedly about a mile into the trail at Mt. Galbraith Park in Golden when he was bitten by the venomous predator.

A woman who was with Hohs on the trail then notified the emergency services, according to The Aspen Times.

First responders arrived at the scene 22 minutes after receiving the initial call for help.

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Daniel Hohs, 31, died on Saturday hours after he was bitten by a rattlesnake while hiking

Hohs was rushed to hospital in Lakewood after first responders received a call at about 12.40pm

'Dan was so vibrant,' said Heather Gollnick, a friend and fellow Ironman triathlete who trained with Hohs. 'He had this huge smile and this energy that just made you happy. It was contagious to everyone'

A doctor who was hiking nearby immediately tended to Hohs after the bite.

Hohs was rushed to St. Anthony's Hospital in nearby Lakewood, where he was pronounced dead.

The snake was described by witnesses as being four feet long.

The Jefferson County Coroner's Office concluded an autopsy on Hohs's body, though the matter is still under investigation.

Hohs, a triathlete who became an Ironman when he completed his first full-distance race in Louisville three years ago, was a software consultant who lived in Steamboat Springs, Colorado.

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'Dan was so vibrant,' said Heather Gollnick, a friend and fellow Ironman triathlete who trained with Hohs.

'He had this huge smile and this energy that just made you happy. It was contagious to everyone.'

In 2014, Hohs wrote a lengthy blog post titled How Endurance Sports Saved My Life . He wrote that he had suffered for years from bipolar disorder. Hohs wrote that endurance sports enabled him to accept his condition and excel despite of it

'He had a way of making them feel comfortable.

'He was just one of those really decent human beings.'

Mt. Galbraith is a popular destination for hikers.

The site offers scenic views of the surrounding areas of Golden, Colorado, as well as the plains and the Continental Divide.

It is flanked by Clear Creek Canyon and Golden Gate Canyon.

Mt. Galbraith is known as a '14er' – or a mountain peak that exceeds 14,000 feet.

'He was out there doing what he loved to do, whether it was doing a 14er and riding his bike to the next 14er while his friends rode in the car,' Gollnick said.

His condition was so severe that during his college years, he checked himself into an in-patient psychiatric facility.

Hohs wrote that endurance sports enabled him to accept his condition and excel despite of it.

Mt. Galbraith is a popular destination for hikers. The site offers scenic views of the surrounding areas of Golden, Colorado, as well as the plains and the Continental Divide

The snake (similar to the one seen in the above file photo) was described by witnesses as being four feet long. The Jefferson County Coroner's Office concluded an autopsy on Hohs's body, though the matter is still under investigation

'I spent the next nine years learning that my alternative brain chemistry is not a disorder, and it is not an illness,' Hohs wrote.

'It is a unique part of me that gives me strength and individuality in so many ways.

'Endurance sports have provided me with the motivation to improve all aspects of my life, deeply reflect on who I am, and most importantly, learn that I can do what I once thought was impossible,' he wrote.

Another fellow triathlete, Eddie Rogers, was roommates with Hohs in Steamboat.

'From what I could figure out, you are 50 times more likely to get struck by lightning then get killed by a rattlesnake,' Rogers said.